Combined check-valve and strainer



Feb. 14, 1933. E. s. CORNELL, JR l897572 COMBINED CHECK VALVE AND STRAINER l Filed Oct. lO, 1930 2 Sheets-Sheet l 1%@ 1M .ifi

' Feb. 14, 1933. E. s, CQRNELLQJR y1,897,571?.

COMBINED CHECK VALVE AND STRAINR Filed 0ct. 10, 1930 *2 sheetssheet 2 Patented Feb. 14, 1.933

UNiTED STATES PATENT OFFICE EDWARD S. CORNELL, JR., OF WATERTOWN, CONNECTICUT, ASSIGNOR TO THE CHASE COMPANIES, INC., F WATERBURY, CONNECTICUT, A CORPORATION COMBINED CHECK-VALVE AND STRAINER Application filed. ctober 10, 1930. SerialNo. 487,749.

This invention relates to an improved combined check-valve and strainer and has for its main object the vprovision at a low cost for manufacture of a simple, reliable and eliective device of the class referred to, constructved with particular reference to sureness of operation and ease of cleaning.

With the above and other objects in viewas will appear from the following, my invention consists in a combined check-valve and strainer having certain details of construction and combinations of parts as will be hereinafter described and particularly recited in the claims.

ln the accompanying drawings:

Fig. 1 is a view in side elevation oi a combined check-valve and strainer embodying my invention and shown as applied to the end of a suction-pipe;

Fig. 2 is a view looking toward the outer end thereoi` 3 is a view in central longitudinal sec- 'tion 'taken on the line 3-8 of Fig. 1 but on a larger scale and showing the closure-andstrainer unit in its open position;

Fig. il is a view corresponding to Fig. 3 but showing the closure-and-strainer unit in its ciosed position;

Fig. 5 is a view oi: the closure-and-strainer unit detached, looking toward the outer face thereof;

Fig. 6 is a. similar view but looking toward the inner face of the closure-and-strainer nnit;

Fig. 7 is a detached view oit the closureand-strainer unit partly in edge elevation and partly in section;

Fig. 8 is a view of the cap detached, looking toward the inner face thereof; and

ig. 9 is a view thereof partly in edge elevation and partly in section.

rlhe particular check-valve and strainer herein chosen for the illustration of my invention is of a type designed as a terminal fitting for the suctionor other outlet-pipes of oil-storage tanks, etc., but it is to be under` stood that my invention is not so limited.

En carrying out my invention as herein shown, l employ a disk-shaped closure-andstrainer unit 10 consisting of a cup-shapedV seat-engaging projection 13 adapted to coact with a conical seat 14C in a cap-member 15 of a suitable housing which, as herein shown, consists in addition to the said cap of a body-member 16 enlarged at its upper end to form a chamber 17 and having a hollow shank 18 formed internally with screwthreads 19for coaction with the external threads 2O of a suctionepipe 21 or. other sii-cit-y able duct.

rlhe enlarged upper end ot the bodynicm ber 16 is provided with external threads 22 upon which are screwed threads 23 formed internally upon the skirt 24 of t e cap 15.

rlhe cap above referred to is preferably -formed of sheetanetal and has its central portion struck up to :torni the conical seat 15k already refer ed to, as well as to provid. retainingflange 25, against the under-lace of which is seated a disk oit metallic ganas 26 which is secured inl place as shown by means of solder 27. The retaining-flange encompasses an inlet-opening 28 provided for the inlet or oil or other uids into the housing in the direction or the arrow i e sheet-metal disk il of the closrr and-strainer unit 10 already referred to i a sliding tit with respect to the annular siden wall or" the chamber 17 and is termed at base of its conical projection 13 with tout segmental passages 9.9 which are separated mental passages 29 therein, is a disk-shaped piece of metallic gauze 31 clamped in place by a relativeiy-large washer 32 formed with an axial passage 33 through which passes a vcoupling-screw Se' having its threaded outer end screwed into :in axial threaded bor;` 55 formed in the fiat outer tace 36 the fcncal projection 13, I

For the purpose' et describing the oper tion of the particular form or" my impr-orf combined check-valve and strainer shown, let it be supposed that the suctionpipe 21 is connected to a suitable pump. If this pump be ofthe reciprocating type, upon each suction stroke thereof the closure-andstrainer unit will be drawn into the position shown in Fig. 3, thereby permitting the inward iiow of fluid through the gauze 26 and through such portions of the edge of the gauze 31 as underlie the segmental passages 29, as clearly indicated by arrows -in Fig. 3. Upon a reverse stroke of the pump, the closure-and-strainer unit 10 will be forced into the position shown in Fi 4, in which the conical seat-engaging projection 13 thereof isseated against the conical seat 14 in the cap-member 15, Ithus preventing the reverse flow of fluid.

By providing a combined closure-andstrainer unit which moves back and forth in response to the tendency of the Huid to iiow' therein, so that, in a sense, instead of being a terminal fitting, my improved device is interposed in a flow-passage.

It will be understood by those skilled in the art that my invention may assume varied physical forms without departing from my inventive concept,` and I, therefore, do not limit myself to the specific lembodiment herein chosen for illustration, butronly as indicated in the appended claims.

I claim:

1. In a combined check-valve and strainer, the combination with a-housing; of a valve-seatin the said housing; a combined closure-and-strainer unit bodily slidable relatively to and within the said housing and formed centrally with a seat-engaging-portion co-operating with the said valve-seat to prevent the flow of fluid in one direction and provided with a strainer outside of thev said central seat-engaging portion acting to lter fluid flowing in an opposite direction.

2. In a combined check-valve and strainer, the combination with a. housing; of a valveseat in the said housin a combined closureand-strainer unit bodily slidable relatively to and within the said housing andformed centrally with a seat-engaging portion cooperating with the said valve-seat to prevent the flow of fluid in one direction and provided with a substantially annular strainer-area surroundin the said central seat-engaging -portion an acting .to filter iuid liowing 1n an op osite direction.

3. n a combined check-valve and strainer,

.ing in an opposite direction.

4. In a combined check-valve and strainer the combination with a housing consisting of a body-member and an apertured cap therefor; of a valve-seat formed in the inner face i of the said cap; and a combined closure-andstrainer unit bodily slidable relatively to and within the said housing and formed centrally with a seat-engaging portion co-operating with the said seat to prevent the ow of iiuid in one direction and provided with a strainer-area outsideof the said seat-engaging portion acting to filter Huid flowing in an opposite direction.

5. In a combined check-valve and strainer,

the combination.l with 'aV-housing consistingv of a body-member and an apertured cap therefor; of a valve-seat formed in the inner face of the said cap; and a combined closure-andstrainer unit bodily slidable relatively to and within the said housing and formed centrally with a seat-engaging portion (3o-operating with the said valve-seat to prevent the flow of iluid in one direction and provided with a.`

substantially annular strainer-areavsurrounding the said central seat-engaging portion and acting to iilter fluid owing in an opposite direction. .o

6. In a combined check-valve and strainer,

the combination with a housing; of a valveseat in the said housing; a. combined closureand-strainer unit bodily slidable relatively to" and within the said housing and consistin of a sheet-metal member centrally emboss to form a seat-engaging portion and perforated in the area around the said centrall embossed seat-engagingl portion to provi e' fluidpassages,.and a strainer-member united with the sa-idsheet-metal member to overlie the perforated portion thereof and bodily movable therewith.

In testimony whereof, I have signed this specification.

EDWARD S. CORNELL, Jn.

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